Liquid dispensing apparatus



3 Shets-Sheet 1 C. P. GRIFFITH ET AL LIQUID DISPENSING APPARATUS Filed July 12, 1941 June 13, 1944.

INVENTORS ATTORNEY.

Clement P Griff): WaHerA. Barr Maw/4M June ,44. c. P. GRIFFITH ET AL LIQUID DISPENSING APPARATUS Filed July 12, 1941 3 Sheets-Sheet 2 .h Tm v 6mm 6 w P4, iv! ne mu cm ATTORNEY. I

June 1944- c. P. GRIFFITH ET AL 2,351,503

LIQUID DISPENSING APPARATUS Filed July 12, 1941 3 Sheets-Sheet S m H M m m w o N N HM A s: w W r ee m 0 W W liquid dispensing apparatus. it relates to improvements in apparatus for dispensing liquids of a given density by displacing- Patented June 13, 1944 LIQUID DISPENSING APPARATUS Clement P. Grimth and Walter A. Barr, Fort Wayne, Ind., assignors to S. F. Bowacr & Company, Incorporated, Fort Wayne, 11111., a corporation of Indiana Application July 12, 1941, Serial No. 402,200

11 Claims.

This invention relates to improvements in More particularly,

them with a liquid of a dltlerent density.

It is an object of the invention to provide an apparatus of the type described which is electrically controlled.

It is another object of the invention to provide an apparatus which can be readily utilized with a plurality of storage tanks.

Yet another object is the provision of auxiliary shut-oil mechanism to prevent the displacement liquid from entering the dispensing lines.

Still another object of the invention is to provide means for filling individual tanks of a tank system.

It is still another object of the invention to provide remote means for delivering liquid from any of the storage tanks to any of a plurality Of delivery points.

Yet another object of the invention is to provide an outlet shut-off valve which is controlled by a high water level in either the main storage tank or the separator tank.

It is another object of the invention to provide automatic filling control means for interrupting the filling operation when a low water level is reached in the supply tank. I

Another object is to provide auxiliary shut-off mechanism utilizing a battery wherein the battery is relieved of load as soon as the desired function has been accomplished.

These and other objects will become apparent from a study of the specification and the drawings which form a part thereof and in which:

Figure 1 shows the displacement liquid controlling means.

Figure 2 shows the illling and overflow control mechanism.

Figure 3 is a view of a modified, single storage tank system.

Mechanical system (and pressure gauge adapted to indicate the reduced pressure. The pipe I3 connects the apparatus just described with the inlet chamber of a three-way, diaphragm operated, master valve 11. This valve is provided with an outlet chamber I! which is connected by a pipe 2| to a waste or sewer pipe 23. The valve is also provided with an outlet passage 2! which leads to the pipe 21 and which has ports 29 and ii which open into the chambers l5 and I9 respectively.

The valve ports 28 and II are controlled by poppet valves 33 and 35, respectively, which are mounted on a stem 31 which passes into a chamber 39 and is connected to be operated y a diaphragm 4| which forms one wall of the chamber. A spring 43 urges the valve stem and diaphragm upwardly. The cap 45 on the valve forms, with diaphragm 4|, a chamber 41 which is connected by a pipe 49 to one outlet of a three-way valve IH which is operated by a solenoid I3. I

Valve 5| has its inlet connected by pipe 55 and T 51 to the line I! and the other outlet is connected by a pipe 58 to the waste pipe 23. This valve is constructed so that when the solenoid is energized the chamber 41 and pipe 49 will be connected to line It through pipe and so that when the solenoid is deenergized, the chamber 41 and pipe 49 will be'connected to the waste pipe 23 b the pipe 5!.

If more than one storage tankis utilized, the pipe 21 is connected to a manifold or header ii and from this a discharge pipe 63 is connected to the inlet chamber 65 of a manuallyoperated three-way valve 61. The outlet chamber 69 of this valve is connected to a waste pipe II while the outlet passage 13 is connected to a pipe I! which enters the storage tank 11 and opens thereinto at a point adjacent the bottom of the tank. A gauging pipe 18 which is provided with a cap is connected to the top of the tank 11.

The passage 13 communicates with chamber 8! through a port 19 and with chamber through a port 8|. The ports 19 and-ii are controlled by poppets l8 and 85 respectively which are mounted on a valve stem 81 which in turn is connected for operation by a hand wheel 89.

Referring now to Figure 2, an outlet pipe 8| is connected to the top of the tank 11 and leads to a T connection 93. One branch of the T 83 is connected to a fill valve which is normally closed and is opened by a solenoid 9' when the latter is energized. The valve is in turn connected by pipe 91 to an upwardly closing check valve 89 and to a fill pipe ilil which may be.

capped as shown but which, for filling, may be fitted with a connection suitable for coupling to g to the top portion of a separator chamber ill by pipe III which contains a check valve III which is arranged to prevent flow from the tank I" to the tank H.

The valve I I! has a poppet III which controls a port ill in the valve and which is connected to stem Ill. The stein is connected to an operating lever-Ill'which is pivoted on the valve body. A pin III, set in the lever, is adapted to be engaged by a latch pawl I28 which'is pivotally mounted at III on support plate I" and which is connected at ill to a tripping member Iii. A spring III connects the lever II! with an anchor on the valve Ill and serves to urge the valve closed. The trippin member is disposed in the path of two tripping pawl; Ill and III which are pivotally connected to the plate I21. Pawl III is connected to the armature of a solenoid III while pawl I8! is connected to the armature of a solenoid Ill. Either solenoid, when energized, will trip the latch pawl I28 and release the valve handle III so that the spring III ma close the valve.

The tank I" is provided with a blow-of! connection Ill through which liquid may be discharged from the bottom of the tank. and with an outlet pipe I" which is connected to take liquid from the top ofthe tank. The pipe enters a header or manifold I" which is connected by various pipes to a plurality of field dispensing stations such as, for instance, the fueling pits disclosed in the Patent Number 1,868,497 issued to Grimth et al. July 26, 1932.

Disposed in the tank 11 is. an electrode holder I" which permits the passage into the tank of control means comprising two electrodes I and Ill. These electrodes are disposed near the bot tom of the tank but preferably a slight distance above the level of the opening into pipe II.

A second set of control means comprising electrodes ill, I are supported at a level near the top of the tank by a holder I". that at which it is desired to stop the inflow of the displacing liquid.

Disposed in the separator tank I01 is a holder I which carries control means comprising electrodes III, III at a level somewhat below the center of the tank and a second holder I" which carries control means comprising electrodes ill,

I" at a higher level in the tank but well below the inlet of pipe I".

Electrical system This level isv closes a circuit D from Ill through lines "I and. III, solenoid It, line I", the contacts of relay ill and line iii to line I". Opening switch II! at any time deenergizes circuits C and D.

The same relay 2|! isenergined when the electrodes ill and I are connected by conducting liquid level rising in the tank II". This circuit F is from line lll through line 2", electrode iii, the electrolyte, electrode I 08, line ill, the winding of relay 2|), line ill to line Ill.

The relay, when energized by either circuit E or 1, sets up a circuit G from line I", through lines 201 and III, solenoid ill, line 228, the contacts of the relay and line III to Ill.

An auxiliary or safety circuit H is provided in the event the main power supply'should fail. This circuit isfrom one pole .of battery 22!, through the winding of relay 221, line 2" to electrode I, through theelectrolyte to electrode I", through line "I to switch I" and line I" to the other pole of the battery. The switch "I is connected by a link 2" with the handle I is of valve I". When the valve is open the switch is closed and vice versa.

When the relay 211 is energized, current flows in circuit I from the one pole of the battery, through the contacts of the relay, through line 23!, solenoid time I, switch I" and line I to the other pole of the battery. When switch 2 opens, both the circuits H and I are opened.

In practice, any desired number of storage and separator tanks with their individual filling and -cut-out control mechanisms and circuits may be In Figure 1, the numeral I'll indicates an electric main which is connected with the input side of an isolation transformer I'll.

The switches I" represent switches which are located at the remotely placed fueling stations. They are connected in parallel between the line I" of the output side of the tranformer and the winding of relay in which is in turn connected with the other output transformer line Ill by a line I. This constitutes circuit A. The relay is normally open and when energized closes a circuit B from line I'll through lines I", solenoid '3, 'line- I", the contacts of the relay ill and interposed in parallel betweenthe two headers. In practice also, water is used as the displace-- ment fluid and the displaced or dispensed fluid is usual-1y lighter than water. such as, for instance, gasoline or other similar liquids.

Dispensing operation Assuming that the supply tanks 11 are in operating condition, that is, with a body of water in the, bottom portion of the tank and a body of gasoline floating on the water and occupying all of the upper portion of the tank to a point below electrodes I I3, I" and with gasoline coverim; all of the electrodes in the separator tankto actuate the relays while water such as is availv able at installations of this type is a relatively good conductor and will pass suiiicient current to permit the relays to operate.

In this specification and in the claims the use of the words conducting liquid" or current conducting liquid refers merely to the relatively better conducting quality of one liquid and does not necessarily imply that,:the other liquid may not have some current conducting ability.

When one of the switches I" is closed, the circuits A and B are closed in sequence, the solenoid I3 is energized and the three-way valve 5| is actuated to connect the chamber 41 with the pipe I! by way of pipes 49 and 55. Water under pressure being thus admitted to thechamber 41 will depress the diaphragm II against the action of spring 43 and will cause the valve95 'to close port II and the valv 93 to open the port 29. This admits water,under pressure, from cham-: ber I5 into the passage 25, pipe 21-, manifold 5| and the pipes 50 and chambers 95 of all of the manual three-way valves 51.

The v'alves 51 are normally set so that the poppet 95 uncovers the port 8| and the poppet closes the port I9. Accordingly, the water under pressure will at once pass through the passage I3 and pipe I5 and be admitted to the bottom of the tank 11.

The valve 95 is normally closed and this and the upwardly closing check valve 99 prevent the water pressure which is applied to tank 11 from forcing gasoline, out through the pipe IOI.

Valve I05 is normally held .open against the action of spring I" by the latch pawl I29. Thus the water entering at the bottom of the tank 'I'I will force the gasoline at the top of the tank out through the pipes 9I, 99, I03, valve I05, pipe I09 and valve III into the top of tank II where,

' due mainly to the reduction in velocity and the reversal of flow, any free water contained in the gasoline will be dropped. ,The gasoline will then to the'bottorn of the separator tank.

As the dispensing of gasoline continues, the

' water-gasoline contact level will rise and eventually the electrodes I53, I55 will be submerged in the body of water. When this occurs the circuit E is established and as soon as the current in this circuit is sufficient to actuate the normally open relay 2I3, the circuit G is closed and the solenoid III is energized to trip the latch pawl I29. The valve I will be closed by spring I93 and further dispensing of liquid from the tank is prevented.

If the shut-off mechanism Just described fails to function due to an interruption of the circuit,

assauos to open port 19 so that the tank is connected by pipe I5, passage 13 and chamber "to the waste pipe II.

Connection is made between the iill pipe IM and the source of gasoline such as a tank car we barge line and the switch I89 is closed. Since the electrodes I49, I5I are submerged in water, the circuit C is established through the winding of the normally open relay I93 and when this closes, the circuit D is established and energizes solenoid 96 to open the normally closed valve 95. v v

Gasoline will pass through check valve 99, pipe 9|, valve 95, T 99 and pipe 9| into the top of the tank and water will pass out of the tank through pipe I5 and the waste'line J I. As this operation proceeds, the water-gasoline contact 'level will the circuit D. The solenoid 95 willbe, deenergized and the valve 95 will close.

It will then be necessary to disconnect the n11 line from fill pipe IOI, operate the valve 51 to close port I9 and open port 9|, and if the system was shut down by water in the separator tank,

- it will be necessary to drain ofi water through 7 operating condition.

water will be passed into the separator tank I01.

water or'both, the contacts IM and I99 will eventually be submerged. This will cause the circuit F to be established and as soon as the current in this circuit is suflicient to actuate the relay 2I3, the circuit G will be established to energize the solenoid III and trip the valve I05.

If for any reason the circuits described above are rendered inefl'ective, the water level will continue to rise in tank I01 but before it reaches the outlet I" it will cover the electrodes I61 and I69 and establish the auxiliary battery circuit H and when the current in this circuit becomes sufficient to energize the normally open relay 221, the battery circuit I through the solenoid I39, will be established and the valve I05 will betripped and closed and the flow of liquid from the tank will 'stop.

,As the valve III5v closes, the switch 233 will be opened and will break both circuits H and I so as to relieve the battery of all load.

In order to place the system which has been shut down in operation again it is necessary first to refill the tank I1. This is accomplished by operating valve 61 manually to close port BI and BISv the drain I 05. This may be done by opening valve I09- and operating a switch I15 which is disposed'adjacent the controls for convenience. This will apply pressure to tank I01 by way of manifold I45. Once water is cleared from the electrodes in both tanks" and I0], valve I05 will remain open so that by closing I08,opening valve I05 by lifting handle H9, 1 and opening switch I89, the system will again be restored to It will be noted that whenall" of the switches I15 are open the circuits A and B are broken and thesolenoid 53 is deenergized. Under such conditions the valve 51 occupies a' position to shut off the pipe 55 and to connect the pipes '49 and 55. The chamber 41 is accordingly relieved of pressure and the spring 43 operates the valve poppets of the master valve to close port 29 and open port II. The tanks TI are therefore all connected to the waste pipe 29 (with the exception of those being filled with gasoline) and are relieved of all pressure except for a small water head in the pipe I5.

If the pressure in line I3 becomes excessive, the relief valve 9 will operate to reduce the pressure to within predetermined limits.

I45while a tank I1 is being filled, the check valve III will prevent such pressure from being ap- I drain and open to the water lines and thereafter to close a switch I15, one of which is preferably located adjacent the filling mechanism controls. Water will then enter the tank and when it rises in the gauging pipe, the water can be cut off by valve 61, the cap be replaced and the filling operation may proceed as described above.

Single tank system If only a single tank 11 is to be used, the valve Should pressure be applied to the manifold 4 assures ll and headers 61 and Ill can beliminated. The pipe '15 would then be connected directly to the passage ll of valve 11 and filling could'be accomplished during the time that'the passage is connected to thewaste pipe 23. Should any of theswitches be closed while the filling operation is proceeding, :the check valve sfl and valve I." will prevent liquid from leaving the system and the filling operation will simply'be stopped until the valve i1 is reversed.

Modified single tanlcrsilstem Referring to Figure 3, the numeral in reiers to a line carrying displacement liquid such as water. This line is connected at the inlet end with the auxiliary controls i, I, l, 1, I, I and II of Figure 1 and at the other end with one port of a three-way,'power operat d master valve it! which is inall respects similar to the valve H, Figure 1. One outlet of the valve is connected by pipe "I to a waste pipe 8!! and the other outlet communicates by a pipe "I with the tank I", and where the displacement liquid is heavierthan the liquid to be displaced, the pipe 315 communicates with the tank at a point adjacent the bottom 01 the tank while the outlet "3 for liquid being displaced is at the top of the'tank. Obviously, it the displacement liquid were of less density than the displaced liquid, the position of these connections would have to be reversed. A gauging pipe I" which is provided with a cap is connected to the top of the tank.

The motor portion "I of the valve is connected byfpipe I to one port of a three-way valve I. The other ports of the valve are connected, one by pipes Ill and 1' ill to the pipe ill and the otherby pipe III to the'waste pipe 323. Solenoid Ill operates the valve from the normal position in which the motor is connected to the waste line and pipe III is closed to the position in which the waste line is-closed and the motor is connected to liquid in the line ll. r

A fill line "I, "I 'containsa valve "I which is normally closed-but which is opened by solenoid I when it is energized.

An electrode holder 3 is provided with control means comprising electrodes 3 and "I which are positioned in the tank slightly above the end of pipe 315. A second electrode holder '3" is fitted with control means comprising electrodes {I2 and "I which are held in the tank at a level below that of the outlet pipe-I.

Pipe "I may lead directly to the dispensing lines but it is preferably connected to a separator tank similar to ill in Figure 2 which is preferably fitted with control means comprising electrodes Iii and In similar to ill and I" of Figure 2, and these electrodes are preferably connected in parallel with the electrodes "1,

I of Figure 3 by connecting electrode it! by wire 8 to wire I" and the other electrode iii by wire I" to wire 313. It is also necessary that a water discharge outlet similar to ill of Fi ure 2 be, provided.

E'lEdtBit'D'd'l litkillmilt 'i l them-ling circuits through'leads-fll and III or to the dispensing circuits through leads "I and I". e

The first circuit 1! runs from the line 833, through I and III through one set or contacts oi. a normally closed relay us, through wire III to one "side of a plurality of parallel connected switches 831 most 01' which are located at the dispensing stations. one 01 which maybe located near the filling controls for special operation. through one of the switches, through line as, through solenoid Ill ot'the water control valve ill. through linelll, through the otherset o1 contacts of relay 8, line III to line ill.

The control circuit N for relay 8 starts at line 338, passes through the winding 0! the relay, through line I, electrodes "2, 1, line 313, switch 314 to line III. This circuit is extended by wires 31. and 8 to the separator tank electrodes "1' and Ill which are connected in'parallel with electrodes 3" and III respectively.

A first filling circuit 0, runs from line 311, through I, through the winding of a normally open relay 3", through Ill, normally'open push button switch III, line I" to "I.

The second circuit P. runs from line 021, through I", through one set or contacts of relay in, line 391, solenoid I" 01 the fill valve 3", line I through the other set 01 contacts of the relay, line I and to line I29.

A third circuit Q runs from line 321, through I", the winding 01' the relay, line "I, normally closed push button III, line "I, electrodes "0,

3, line "I to the movable, right-hand contact of relay us, Ill to as. 1 This circuit forms a holding circuit for the normally open relay I'll.

Operation Assuming that the tank 311 contains liquid to be dispensed, in order 'to initiate dispensing it will be necessary to shift the switch IN to energize lines III, I and to see that switch I" is closed. Thereafter, closing of any or the service switches 881 will energize circuit M described above and the solenoid "I so that the waste line "I will be closed and water under .pressure will be applied to the motor "I.

Operation of the motor and valve III closes the waste line "I and admits water under pressure to tank 311 through pipe 315 and as a result the gasoline which is above the water will be forced from the tank through pipe ll! when a service outlet is opened, whence it will pass through a separator like Ill (Figure 2) and out to the dispensing nozzles.

Dispensing may be continued until the water level in the tank submerges electrodes "2, I, orelectrodes III, in in the separator, swhereupon circuit N will be closed and the winding 0! the relay 3 will be energized; the relay will be opened to deenergize circuit M includingsolehold 353 so that valve "I will cut of! the water pressure and connect motor I" to waste, valveilll'w niilmrrsiorflrfismates211's'cssnsurtt'utisiirlti ill it runs )rmera t1 ital lcsiun lhil mrsltsl es: .ottzlrat. .s 11: pee: :11 IELB] tctlieosr [will lie! m1 halve-(lad still its tanin ltsisi in '[lllnrw rrriinlims iasuc OIZIlDlIillllSBIlt dyl IJCItU'IHMElIiZiIlEI ms hwir hale nmccsctle ([131 m1 llttllllim s disc 0 a n is :iaI-i d (U051 'trmiieimerati ill i llTat cqwism errmsss Ill! suit (I ;l Ill Until m mnereetil ll; :loliisi m mputltsidrl l :1 u Whisk u swwih: will! 51 mrnerer'gezsl him will it is: 1" iiimrmi wlarrnilci mroi'erillii i hmlliilm astartermelwatcfiilili i ttmlrenn'sttt KlDEllKilfll r itlts'xsist rtr iii Bill 'ir oinmrtnrilyl 'lili'n lsswvtdtr :1 l is laacplotla s )i s supply) rwevec tliitzfri L J1 ii i ii 51 tfihtc rene'izgds zsi ccrliu 190. mild: Engines rtt'tliw incl 1 iljlilp: piznelilllllo; a scso'wcceios'lipmpi was all isrliiirtuig ing of the relay 310 to close the contacts thereof which results in the energization of both the circuits P and Q. Circuit P causes the valve 3" to be opened so that gasoline may flow into the tank while water is displaced through pipe I" and valve Ill to the sewer. The circuit Q is established. through the winding oi the relay upon closingv of the contacts and maintains the contacts thereof, and consequently, the circult P closed.

The iilling operation may be terminated at will by opening circuit Q through momentarily depressing the switch button 382. Filling may again be started by pressing the starter button 3".

Filling will be stopped automatically when the water level in the tank is depressed below the electrodes 3, "I so that the latter will be submerged in gasoline. This interrupts the-holding circuit Q and consequently deenergizes the relay windings and the circuit P is opened and valve 395 closes.

If at any time during dispensing, water should accumulate in the separator tank to a sumcient height to close the electrodes i6l I63, the result would be to energize the circuit N comprising the lines I", I, I'll, 303 and the winding of relay 3 so that the contactsof the relay will be opened. The circuit M would be thereby deener'gized. Valves "I and Ill would then shift to their inactive positions and stop dispensing'.

In filling the tank 311 initially or after cleaning or repairs, it is necessary to shift switch 325 to energize lines "1,333 to open the gauging pipe 318 and switch 314. Thereupon, operation of a service switch 331, one of which is preferably located near the filling controls, will apply water under pressure to the tank and the air will be driven out the gauging pipe 318. When water rises in the pipe, the service switch may be opened and the gauging pipe and switch 314 closed. Thereafter, the tank may be refilled as described above;

It is obvious that various changes may be made in the form, structure, and arrangement of parts without departing from the spirit of the invention. Accordingly, applicants do not desire to b limited to the specific embodiment disclosed herein primarily for purposes oi illustration; but instead, they desire protection talling 'iairly within the scope of the appended claims.

What we claim to be new and desire to protect by Letters Patent oi the United States is:

1. In a liquid dispensing system, the combination of a tank for storing the liquid to be dispensed, a displacement liquid inlet for said tank, a dispensing outlet in said tank, a separator connected with said outlet, and a valve disposed between said tank and separator, valve- 'closing means, comprising control means in both said separator and said tank actuated by predetermined levels of displacement liquid, for closing said valve, and additional control means for closing said. valve when displacement liquid attains a different predetermined level in said separator.

3. In a liquid dispensing system, the combination of a tank for storing the liquid to be dispensed, a displacement liquid inlet for said tank, a dispensing outlet insaid tank, a separator connected with said outlet, and a valve disposed between said tank and separator, automatic valve closing means, comprising control means in both said separator and said tank actuated by predetermined levels oi displacement liquid, ior closing said valve and manual means for opening I dispensed, a displacement liquid inletfor saidtank, a dispensing outlet in said tank, a separator connected with said outlet, and a valve disposed between said tank and separator, valve nected with said outlet, a valve disposed between said tank and said separator, valve closing means,

means for holding said valve open, means responsive toan accumulation of current conducting liquid in said separator for disabling said holding means and for keeping it disabled until the level of said liquid is lowered.- I

6. In a liquid dispensing system, the combination of a tank for the liquid to be dispensed, a

source of displacement liquid, means operable at will to introduce displacement liquid into said tank, a separator connected to and disposed to receive liquid dispensed from said tank, and means connected between said tank and separator for stopping the dispensing oi'liquidirom said tank comprising electrically actuated means, under the control of electrodes disposed in said separator, through which electrodes 9. current flows when said electrodes are connected by current conducting liquid in said separator.

7. In a liquid dispensing system, the combination of a tank for storing liquid to be dispensed.

means for connecting said tank to a source of dis-- placement liquid or to waste, means for filling said tank with liquid to be dispensed comprising a liquid inlet, a normally closed valve-in said inlet, a solenoid adapted, when energized, to open said valve, a circuit comprising said solenoid andthe contacts oi a relay, a normally open circuit operable manually to close said relay and energize said first circuit and the solenoid, and a holding circuit'for said relay comprising the winding of the relay anda pair of electrodes disposed in 1 said tank at the minimum level of displacement liquid whereby said circuits will be broken and said valve will close when said level is reached.

8. In a liquid dispensing system, the combination of a'tank for storing liquid to be dispensed.

a waste line, means normally connecting" said tank and waste line but operable to connect said tank to a source of displacement liquid, means for introducing displacement liquid into said tank comprising a control valve, a solenoid for operating said valve, dispensing circuits for controlling said valve, one circuit comprising the contacts or a normally closed relay and a normally open control switch and a second circuit comprising the winding of said relay and electrodes disposed at the maximum level of displacement liquid in the tank, means for filling said tank with liquid to be dispensed comprising aninlet having a normally closed valve and a solenoid for opening said valve, circuits for controlling the filling of said tank including a first circuit comprising said solenoid and the contacts of a normally open relay, a holding circuit comprising the winding of said normally open relay and electrodes disposed at the minimum level of displacement liquid, and a starting circuit comprising a normally open switch and the winding of said normally open relay, an electric power line, and a selector switch adapted to connect either the filling control circuits or the dispensing control circuits to the power line.

9. In a liquid dispensing system, the combination of a tank for the liquid to be dispensed, a dispensing outlet for said tank, a shut-oil valve in said outlet, a water separator connected to said valve, means for urging said valve toward closed position, latch means for holding said valve open, electrodes disposed in said tank and said separator, power means controlled by said electrodes and adapted to release said latch means upon contact of the electrodes with water either in said tank or in said separator, and an auxiliary latch releasing means for said shut-oil! valve, comprising battery actuated means controlled by electrodes inserted in said separator but disposed to be actuated by a higher level of water than said first mentioned electrodes.

10. In a liquid dispensing system, the combination of a tank for the liquid to be dispensed, a dispensing outlet for said tank, a valve in said outlet, a water separator connected to said valve, means for urging said valve toward closed position, latch means for holding said valve open, electrodes disposed in said tank and said separator, power means controlled by said electrodes and adapted to release said latch means upon contact of the electrodes with water either in said tank or in said separator.

11. In a liquid dispensing system, the combination of a tank for the liquid to be dispensed, a dispensing outlet for said tank, a shut-off valve in said outlet, a water separator connected to said valve, means for urging said valve toward closed position, latch means for holding said valve open, electrodes disposed in said tank and said separator, power means controlled by said electrodes and adapted to release said latch means upon contact of the electrodes with water either in said tank or in said separator, and an auxiliary latch releasing means for said valve comprising battery actuated means controlled by electrodes inserted in said separator but disposed to be actuated by -a higher level of water than said first mentioned electrodes, and meanscontrolled by said valve upon closing for disconnecting said battery actuated means.

CLEMENT P. GRIFFITH. WALTER A. BARR. 

